is a very special blaser mag/stock insert. i purchased this (in error) to see if i could convert my old mag to this but it does not fit my steyr mag system. this is an insert that holds 4 rounds from the following calibres.
5.56 x 57.
7mm - 08 rem.
.243.308 win and 6mm rem.
please check before you buy if REALLY is what you need, £30 cash posted UK mainland only, and thats less 1/2 what i paid a year ago.